Self-locking spring



June 16, 1925.

A. KRAKAUE-R SELF LOCKNG- SPRNG Filed Feb, e, 19234 INVENTOR Abraham .ffm/maar Patented June 16, 1925. i

lTEDj ATES i PAT EN rfoFFicE.

snLr-tociiinc'f- SPRING.

applicati@ flied February e, 1924. serial No. ceases.

ly' and easily mounted and lockedv into place in variable 4spaced relation by a simple movement..` Y

In the drawings,.Fig. 1 is a perspective view ofmy invention showing a series of springs` locked, in` place; Fig.. 2 is topy plan view of a portion of Fig. 1 showinga coil springsecured in position; on a flat supporting4 strip.` Fig. 3 is ayvertical section of the line 3-3,of1Fig.i2,jFig.. 4 is asimilar sectiononithelinelf-Lnof Fig, 2 and Fig. `5 is :uperspectiveview ofny invention as ap plied `tof av (cross bars In; mountingcoil. springs. as 10 for use in the backsand. seats :of chairs or` other upholstery,7it is4 desirable toprovide a firm b'ase fori-.supporting the springs on which base the. pressure` due to `the compression of thespring"isexeizted, while at the same Vtime maintaining the `spring against displacenient` or danger of `accidental removal from `the mounting therefor. j

It willbe understood that there are two important types of supporting members in usefor supporting coil. springs, thatis, a flat strip as 12, used mainly for upholstered backs, andi asliapedcrossbar as 13, used. mainly for seats. My improved mounting is adapted to both types of support. Said mounting comprises, in brief, an archshaped projection as 11, substantially of the same thickness as the material of the support, pressed outwardly from the support itself to a sutlicient height to allow the pas sage thereunder of the wire of which the spring 10 is made.

More specifically, the space 17 thus formed between the inner face of the projection 11 and the outer face 18 of the support, is substantially of the same size as or slightlyV larger than the diameter of the wire of the spring 10. It is therefore a simple matter to insert the end 15 of the spring into said sp'tce.171.7` underneath the projection. `1 1. AfterY this has been done,the entire spring need 'only be rotated bodily, thereby advancing the end lthrough the. projection lllfandon to the surface 18.

' j The` rotation above described, is continued untilprevented by the engagement. of

the end` 15 of the spring with the edge 10 of the strip 12 or cross bar .18, whereupon the spring` is locked into place by depressing said end 1 5, in a` direction axially of said spring underneaththe lowerinost corner of said edge and further rotating said. spring.

Inthje case of the cross` bar 13, the spring becomesh locked in position automatically aftenfther end 15. has passed the edge 16,. due to the upward movement` of said endby reason of the spring action, as is fully. pointed out. inv my (3o-pending application for Letters Patentwofthe United States, Serial Number 680,080 filed ,December `12, .1923. Inthecaseof the strip 12,` theend 15,1331

reason of similar upward sprin'gaction passes `through theiiext. alternate opening 17 madein the stripY 12 and spaced from that opening 17, k through,whichythe spring 10 was first` passed, until stopped by the under surface of the projection 12.l lFurtheiro.- tation, of the springlO, causes the endl to pass beyondV said` projection and. to spring out upon `the surface 1 8.`

`The en d 15 of the spring 10 is preferably bentupwardly to insure the spring action, abovedescribed, taking place and to preventthe ready removal of thespringby no tation injthedirection opposite to 4 that given thereto during` the mountingf operation. It will be Vseen` that I preferto space the proitensall., in.. Such a, manner, thatthe. diS- tance between the.f operative projections is somewhat greater than the diameter of the lowermost coil of the spring 10. Said lowermost coil may therefore rest firmly on the surface 18 without engaging or interfering with any of said projections excepting the one through which the spring has been passed.

It will be understood that additional pro jections 11 may be spaced as illustrated so as to come substantially in line with the aXis of the coil spring 10 without interfering with the mounting thereof, so that only alternate projections 11 become operative in the strip 12 to lock the spring in place.

It will be seen that the simplest method by which said arch shaped projections 11 can be made is by first making a pair of parallel cuts as 14 in the surface 18 of the members 12 and 13 and then pressing that portion of said bar or strip between said cuts 14 outwardly from said surface 18 to the desired height.

It will also be seen that a series of coil springs may be mounted on the support at any desired intervals by merely inserting` the end of each of the coil springs the proper number of projections 11 from the other springs.

lt will be seen further that the lowermost coil rests almost completely on the surface 18 of the strip 12 or the cross bar 13 whereby a firm base for said spring is provided and the spring prevented from loosening or displacing itself and from departing from the perpendicular. It will be seen further that the insertion of the spring can be accomplished rapidly and effectively by unskilled labor and that once assembled the spring is firmly held by tension against accidental displacement or displacement in any manner.

I claim:

1. In combination with a coil spring, means for locking said spring in-position comprising a support at the lower end of said spring, means pressed from said support adapted to allow the passage of said lower end of said spring therethrough, and a bent end on said spring in sprung engagement with the under surface Aof said support and passing through said support to the upper surface thereof for preventing relative rotative or other displacement of said spring and said support.

In combination with a wire coil spring, means for supporting said spring at one end thereof comprising a supporting member, and means integral with said member at the ends thereof and pressed outwardly from said member at the sides thereof to provide a space between said pressed out means and the outer surface of said support, an upwardly bent end on said spring, a lowermost coil on said spring terminating in said bent end passed through said space and having said end pulled downwardly out of its unstressed position into forced contact with the upper surface of said support for part of the circumference of said coil and into forced contact with the under surface of said support for the remainder of the circumference, said bent end passing upwardly through said support.

3. In a support for coil springs, a series of arched lprojections each pressed outwardly from the upper surface of said support a distance sufficient to allow the wire of the coil spring to pass between said projections and the remainder of said upper surface, said projections being spaced apart a distance slightly greater than half the diameter of the lowermost coil of the coil spring, and a coil spring passed through one of said projections and in contact with the upper surfa-ce of said support and pulled near the end thereof into spring contact with the under face of said support.

4. The combination with a series of wire coil springs, of means for locking said springs in place comprising a spring support, means for locking part of the lowermost coil of each of said springs in pressed contact with the upper surface of said support and for locking part of said lowermost coil in pressed Contact with the under side of said support comprising a series of archedv projections pressed upwardly.

from, and integral at the ends thereof with, said upper surface, said projections being spaced apart a distance substantially greater than half the diameter of said lowermost coil and being adapted to have said lowermost coil passed therethrough, and an upwardly bent portion at the end of said lowermost coil adapted to engage the under surface of said support, and to pass through said support from. the under to the upper surface thereof at one of said projections for preventing relative rotative or other displacement of said lowermost coil and said support.

ABRAHAM KRAKAUER. 

